Cooperative bonding affords a holesome story

Article Abstract:

A robust hydrogen-bonded porous crystal has been synthesized. The organic molecule that self-assembles to form a three-dimensional, hydrogen-bonded network is pseudo-tetrahedral that has complementary hydrogen-bond donors and acceptors on its periphery. The hydrogen-bonded network has some unusual properties, such as the ability of the roughly square cavities that make up the hydrogen-bonded network to crosslink, making the cavity an infinite microchannel, whose inner walls contain the excess hydrogen-bond-donor sites that efficiently bind solvent molecules, such as 1,4-dioxane, acetonitrile and water. The crystals may lose solvent under vacuum, but retain their crystalline form even after losing 66% of the dioxane molecules.

Crystals, Magnetic properties, Cooperative binding (Biochemistry)

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Sugars out in the open

Article Abstract:

Research into the structure of the cell-wall polysaccharides of a poorly characterized Proteus microorganism has led to the discovery of the first example of an open-chain glycosidic linkage. It is not known whether the bacterial polysaccharides found to contain these new linkages have significant biological functions. It is possible that they play an important role in the stability of the cell walls, or they may be significant cell-wall antigens.

Microbial polysaccharides

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